Still a knitting Noob
Is it a symbol on a chart? If so, there should be a key close to the chart telling you what it means.
Is it on a chart or in a written pattern? In a written pattern, it could be a replacement for the * which would indicate a section to be repeated.
It usually means knit to together followed by a 0 for a yarnover.
There should be a pattern key. If not, contact the publisher or designer. (For example, in my patterns it would mean purl-2tog - but that’s me)