I often have trouble remembering little details of things and using mnemonics solved that problem completely. I only started using these tricks recently and its resulted in me permanently remembering details which I used to have to look up every time. Heres the ones I use SOH CAH TOA - You probably all know that one CHO SHA CAO - The same as the one above but for csc, sec and cot. NOD - Numerator over denominator. I forgot that one about a thousand times before I decided to just remember the word NOD. Can you list any highly useful mnemonics you use for remembering details in maths, physics, chemistry etc.