what does bb mean

Fairly new to this site and I came across terms like 300 x bb when reffering to size of bank roll one neads to play certain limits. I thought it probably meant big blind but then on the way to the store I thought well it could mean big bet. When I got home I did a search and of abbreviations and poker terms and it says it could mean either depending on context. [img]/images/graemlins/frown.gif[/img]

Got tired of searching so figured I would just post about it.