data(symbol): the symbols by their names too

II, PP, SS, sq, mul, vv, xx, oo, dn, inf, and deg were the only way to
∫ ∏ ∑ √ × ✓ ✗ ● ↓ ∞ °; integral, prod, sum, sqrt, times, check, cross,
circle, down, infinity, and degree find them as well.

map/symbol.src

@@ -53,10 +53,10 @@
 α	alpha
 β	beta
 χ	chi
-°	deg
+°	deg	degree
 δ	delta
 Δ	De
-↓	dn
+↓	dn	down
 ₑ	_e
 ε	eps
 η	eta
@@ -64,40 +64,40 @@
 γ	gamma
 Γ	Ga
 ⁱ	^i
-∫	II
-∞	inf
+∫	II	integral
+∞	inf	infinity
 ι	iota
 κ	kappa
 λ	lambda
 Λ	La
-×	mul
+×	mul	times
 μ	mu
 ⁿ	^n
 ν	nu
 ω	omega
 Ω	Om
-●	oo
+●	oo	circle
 ₒ	_o
 φ	phi
 Φ	Ph
 π	pi
 Π	Pi
-∏	PP
+∏	PP	prod
 ψ	psi
 Ψ	Ps
 ρ	rho
 σ	sigma
 Σ	Si
-√	sq
-∑	SS
+√	sq	sqrt
+∑	SS	sum
 τ	tau
 θ	theta
 Θ	Th
 ↑	up
 υ	ups
-✓	vv
+✓	vv	check
 ξ	xi
 Ξ	Xi
-✗	xx
+✗	xx	cross
 ₓ	_x
 ζ	zeta