Level

Level or levels or may refer to:

Concepts

Water level, the average height of a water
- Sea level, the average height of the ocean's surface, reference of height systems

Level (algebra), the least number of squares that sum to $-1$ in a field
Level set, a set where a function takes on a given constant value
Level measurement, instrumentation techniques to measure height within a vessel
Level of measurement, a theory of the kinds of scales or levels used for measuring
Level (logarithmic quantity), a logarithmic measure defined as the logarithm of a ratio of two like quantities, often expressed in decibels
Level, for a Categorical variable in statistics, the different values that such a variable can have
Level, in Applied statistics, the different values that a factor can have
Level, in the Design of experiments, the different treatments that are applied within a factor
Classification levels, in Biological organisation, classrooms, churches, hospitals among others
Energy levels, discrete amounts of energy that can be held by a quantum mechanical system or confined particle

Level (music), similar to but more general and basic than a chord
Gal Level, award-winning R&B girl duo from Windhoek, Namibia
"Levels" (Avicii song), a song by Avicii
"Levels" (Bilal song), a song by Bilal from his album Airtight's Revenge
"Level" (The Raconteurs song), the fourth single from The Raconteurs' debut album Broken Boy Soldiers
"Levels" (Meek Mill song), a song by Meek Mill from the Maybach Music Group compilation Self Made Vol. 3
"Levels" (Nick Jonas song), a song by Nick Jonas from the reissue of his second studio album, Nick Jonas X2
Levels, the second studio album by South African recording rapper AKA

Level (airline), a Spanish airline
LeveL, a games magazine in the Czech Republic, Romania and Turkey
Level, a games magazine in Sweden
Level Vodka, a brand of vodka
Level playing field, a concept about fairness where all play by the same set of rules
a collection of objects with the same rank in a hierarchy; see Overlapping hierarchy
a layer of defense in American football; see Two-level defense
an indication of the number of previous posts to a forum thread at which a portion of text was written
Level crossing, a place where track and road meet at the same level