function
board
collection
college
concept
education
educational
einstein
emc
emc2
energy
equation
equivalence
flat
formula
glyph
graphic
icon
illustration
knowledge
law
learn
learning
lesson
letter
line
mass
massa
mathematic
mathematical
mc
mc2
outline
physical
physicist
physics
pictogram
research
rule
school
science
scientific
set
sign
silhouette
study
studying
symbol
theory