תשי"ג is a year in the Jewish calendar. Hebrew years and numbers related to the Jewish calendar are written as Hebrew letters. Each letter gets a numerical value, eg- Alef א is 1 and Taf ת is 400. Actually the full year is ה'תשי"ג ה'=5000 ת=400 ש=300 י=10 ג=3 SUM= 5,713 or the year 1952/1953 You can read about this system here: http://en.wikipedia.org/wiki/Gematria And about the year 5713 here (HEBREW): http://he.wikipedia.org/wiki/%D7%94'%D7%AA%D7%A9%D7%99%22%D7%92

I agree with Ruth, it looks like the Hebrew year (1952/1953)

What is the context? Maybe: 1. hebrew year which relates to 1952 2. A number 713 3. Acronym for something ..