== small letters ==
a : A : cmraT or cofeT
b : B : cmraT or cofeT
c
d
e : expr = expressions
f : some generic function
g : some generic function
h : heap
i
j
k
l
m : iGst = ghost state
n
o
p
q
r : iRes = resources
s : state (STSs)
t
u
v : val = values of language
w
x
y
z 

== capital letters ==
A : Type, cmraT or cofeT
B : Type, cmraT or cofeT
C
D   
E : coPset = Viewshift masks
F : a functor
G
H : hypotheses
I : indexing sets
J
K : ectx = evaluation contexts
    keys of a map
L
M : maps / global CMRA
N : namespace
O 
P : uPred, iProp or Prop
Q : uPred, iProp or Prop
R : uPred, iProp or Prop
S : set state = state sets in STSs
T : set token = token sets in STSs
U
V : abstraction of value type in frame shift assertions
W
X : sets
Y : sets
Z : sets

== small greek letters ==
γ : gname
σ : state = state of language
φ : interpretation of STS/Auth

== capital greek letters ==
Φ : general predicate (over uPred, iProp or Prop)
Ψ : general predicate (over uPred, iProp or Prop)