There are many different fonts used for different teams. There is no standardised font for numbers or names.
However, there are examples of fonts in the "Related Links" section
PERCIVAL in tiger font
Carlos Valderrama used to wear the No. 10 shirt.
The font that is used on this jersey is Futura Condensed. It was picked out by the marketing department for this group to make the name more recognizable.
What is the font for the Cincinnati reds logo
demonized and century gothic.
Big Noodle Titling
Those fonts were the standard baseball fonts throughout the early 30's and 40's. Join www.sportslogos.net in the forum section. there is a thread there where almost every MLB font can be downloaded, including the RedSox front jersey letters. The back name letters and Numerals are also available. the font for the numbers is MLB RedSox, for the Front of jersey script, it is MLB Tuscan.
They likely used Jersey Letters font or similar.
It is possible to have the number zero on a soccer jersey, but must be formatted so that there are two zeroes like this: 00. It just has to be different from other numbers, and it must not exceed two digits.