73

73 is an Arc Number in Chrome's Show of Chromeyness. It's importance is not explained yet, but it has something to do with VECTOR LAND.

Trivia

 * 73 is the 21st prime number, and Chrome's number of production is mentioned once as being 7321.
 * 73 was mentioned by the creator in a Q and A to be "A VERY IMPORTANT NUMBER".
 * 73 might be related to MattBoo somehow, as his hat spelling "LOL" sometimes changes to "73" for a very brief moment in every episode he appears in.