13 (thirteen) is the natural number after 12 and before 14. It is the smallest integer with eight letters in its spelled out name in English. It is also the age at which children become teenagers.

Strikingly similar folkloric aspects of the number 13 have been noted in various cultures around the world: one theory is that this is due to the cultures employing lunar-solar calendars (there are approximately 12.41 lunations per solar year, and hence 12 "true months" plus a smaller, and often portentous, thirteenth month). This can be witnessed, for example, in the "12 days of Christmas" of Western European tradition.

To put it simply, 13 is my fav number and 'th' are the initials of my name (Terence Ho).