Properties of the number 50

Symbolism

Symbolize the "total" man.
Represent the Universe being expressed by the individual lives, according to R. Allendy: "it is a favorable number marking a grace, a kindness, a regeneration".
According to Eckartshausen, it is the number of "the spiritual ascension to the intuition, the number of the illumination".
Considered as "the holiest and the most natural of numbers, because it equals to the sum of the squares numbers 9+16+25 constructed on the sacred triangle of Pythagoras (3, 4 and 5) and also to the product of 5 x 10 of the pentad and the decade, numbers of the generating Life and the World-Harmony, the Microcosm and the Macrocosm".
The number 50 corresponds to the Hebraic letter "nun", form reminding a cup pouring its content. It is also associated to the fourteenth Arcane of the Tarot: the solar Angel, interpreted in general as the sign of the change, the mutations and the metamorphoses.
Number of the joy and the feast, according to the Bible.

Bible

The feast of the Pentecost was celebrated by the Jews 50 days after the Passover.
Fifty of the brotherhood of prophets assisted with Elisha to the removal of Elijah on a chariot of fire. (2 K 2,7)
Fifty men searched Elijah during three days without finding him. (2 K 2,17)
Moses received the commandments fifty days after the exit of Egypt.
After the age of fifty, the Levites is no longer bound to the ministry. (Nb 8,25)
Width of Noah's Ark in cubit. (Gn 6,15)
It is the number of chapters of the book of the Genesis of the Old Testament.

General

The Cabal speaks about the 50 gates of intelligence which would be all the possible objects of the knowledge, summarizing the creation, while 32 ways of the Wisdom would be the instruments of the knowledge. In the cabalistic tradition, it is told that Moses has not been able to cross 50th gate.
A jubilee in the Hebraic religion has a duration of 50 years where during this period a year had to be devoted to God and to the rest. The Hebraic law canceled all the debts and all the faults in this fiftieth year. The slaves were also released every 50 years, the agricultural work was suspended and the alienated plots of land returned to their primitive proprietors or to their descendants. One would want thus to avoid the definitive enslavement of the weak.
The trip of the Holy Family to flee in Egypt took approximately fifty days, according to visions of Mary Agreda.
According to writings of Maria Valtorta, 50 soldiers kept guard around the summit of the Golgotha, during of the crucifixion of the Jesus Christ.
The Essenes had ritual meal in particular the day of the Sabbath and also every 50 days, the numbers 7 and 50 being sacred for them. During the feasts of the 50th days, in more of usual ceremonies, they sang hymns.
Some authors see in the name of Jesus an analogy with the era of Fish and the number 50, this one corresponding in Hebrew to the value of the letter "noun" (or "nun") and in Greek to the letter "nu". "noun" means also fish and, according to the book of Numbers of the Bible (chapter 13 verse 16), Hoshea, that Moses designated for his successor, was the son of Nun. Moses changed his name in Iehoshouo, Joshua, whose Ieshouo, Jesus, is a diminutive.
The padre Pio received the stigmata in September 1918 and he was revealed to him that he would carry them 50 years. Indeed, he died in September 1968. The stigmata disappeared three days before his death.
The 50 grains of the rosary Aksha-Mala of Indians.
The Argonauts, that left to search the Golden Fleece, were 50 Heroes.
The 50 sticks, all the same length, which are handled in the consultation of the Yi King.
Hercules had 50 son, born from the 50 sisters, girls of Thespios.
The 50 Danaides marry, then slaughter their 50 cousins, except the last, Lynceus, which slaughters to his turn the Danaides.
In the Greek mythology, we count 50 nereids, girls of Nereus, marine god, and of Doris, which personify the waves. Few between them are named. The most known are Amphitrite, wife of Poseidon; Galateus, mistress of the cyclops Polypheme, and Thetis, mother of Achilles.
According to an Islamic legend, when Mohammed was received by God, he received the order to prescribe to the converts the daily recitation of 50 prayers.
Priam had 50 son that were all killed. It is the last one, named Paris, that caused the Trojan War.
Lycaon, king of Arcadie, had 50 son exterminated by Zeus.
Pallas, brother of Aegeus, had 50 son that Theseus killed.
The moon is fifty times smaller than the Earth.

Here is a magic square of twenty five boxes, bases 50, containing only the numbers having an arithmetical progression of the reason 5, that is to say 0, 5, 10, 15 and 20.

                              0  5 10 15 20
                             10 15 20  0  5
                             20  0  5 10 15
                              5 10 15 20  0
                             15 20  0  5 10