I have a note in the Message Posting Tips about spelling out words with the acronyms to make posts easier to understand and search for. I also list HST, JMT, and PCT in a list of things to search for.
... Try to be as specific as possible, but do not assume that all readers will understand special lingo. Also, consider adding words that would help a future reader find your thread when doing a keyword search (use both full names as well as appropriate abbreviations when appropriate like "John Muir Trail" followed by "JMT").
What do you have in mind? There is always Google. Here is the
Wikipedia link.
You can play with these:
AMS – Acute Mountain Sickness
HST – High Sierra Trail
INF – Inyo National Forest
JMT – John Muir Trail
LP – Lone Pine
MMWT – Main Mount Whitney Trail
MR – Mountaineers Route
NF – North Fork or National Forest
NP - National Park
PCT – Pacific Crest Trail
YNP – Yosemite National Park