What is the prefix for trace?

There isn't one specific prefix that is universally used for "trace". However, depending on the context, you might see prefixes like:

* Retro-: meaning "backward" or "behind", as in retrotrace (to trace something backwards).

* Hyper-: meaning "excessive" or "beyond", as in hypert race (to trace something in excess).

* Pre-: meaning "before", as in pretrace (to trace something in advance).

It's important to remember that these are not standard terms and might not be used widely. The best prefix to use depends on the specific meaning you want to convey.