Is there a gadget for cutting specific angles in wood accurately?

[sunshinecity1726]

Something smallish that you could use with a handsaw?

I think it's called something like a mitre gauge

www.screwfix.com/p/mitre-box/7048V?tc=AA7&ds_kid=92700030952054462&ds_rl=1245250&ds_rl=1249481&ds_rl=1249796&gclid=EAIaIQobChMIsvPYyMGV3AIVlfhRCh2G9gGZEAQYASABEgIMjPD_BwE&gclsrc=aw.ds&dclid=CM6uvsvBldwCFdIX0wodXTALQQ

Yes, it's called a Mitre box

Mitre block