What is it ???🤔

 

Ans.

The answer is: the letter "Y" (in English, "Y," in 

German, "Y" or "Üpsilon"). Why? Boys → 

contains a Y → "Boys wear it daily" = the letter Y 

is in the word "boys" (and also in "daily") every day.

Girls → does not contain a Y → but "once a year" 

→ the word "year" contains exactly one Y.

Therefore, boys "wear" the letter Y every day (in 

the word "boys"), girls only once a year (in the word "year").