Hi Daphne and welcome to GoY. A full sun means plant in full sun, a half sun means plant in semi shade, can't remember the symbol for full shade plants.

temperature shown if it is just one temperature that is the minimum temp the plant can take... could be something like -5˚C

It might be easier if you take a photo of a label you can't understand and add it to your question.

I wish I knew? These were a few of the garden labels I have found confusing or what? Each has its own symbol and no words - its getting far too silly now!

Full Sun
Partial Sun/Partial Shade
Full Shade
Alpine Plant
Evergreen
Groundcover
Good for container growing
Good cut flower
Drought Tolerant
Attracts Hummingbirds
Attracts Butterflies
Autumn colour
Regionally grown
Purifying
Deciduous
Cones
Frost Hardy
Full Hardy
Prunning period
Climbing
Balcony plant
Scent