Skill level
From Alter Aeon Wiki
Skill level is the effective level at which you perform Warrior or Thief skills. The base level is equal to your level in the respective class. For example without any boosting gear a level 15 warrior with have a skill level of 15 and a level 15 thief will have a skill level of 15 as well. Wearing items with the respective WARR_SKILL_LEVEL or THIEF_SKILL_LEVEL affect will increase the effective level. Items are limited to 1 skill level boost per item with the exception of two-handed weapons/shields which can have a max of 2.
To view your current skill levels, type show skill. You will get a message such as:
Your skill level is level 33 thief, level 35 warrior.
Which is your current skill level including any bonuses from equipment or spell affects added.