(Because Im designing a woven fabric label where I want to be able to write a production number and the year of construction by hand in time.)
How to learn MORE by making mistakes:
searching for whatsit that I dont know the name of and trying [wrongly] with
uppercase o
https://en.wikipedia.org/wiki/Omicron
then searching for number international abbreviation nr no
https://en.wikipedia.org/wiki/Numero_sign



THEN starting a search for an international symbol for 'Year:'
http://rachelsenglish.com/pronounce-letter-y/#


Into something different (how different?):
What about the letter 'Y' ['y' is different why?] as a "road" symbol?



Short for Signature?