NearestTo
NearestTo[x] is an operator form that yields Nearest[elems,x] when applied to a list elems.
NearestTo[x,n] is an operator form that yields Nearest[elems,x,n] when applied to a list elems.
NearestTo[x,{n,r}] is an operator form that yields Nearest[elems,x,{n,r}] when applied to a list elems.
Examples
Find the nearest element:
NearestTo[2.5][{1, 2, 3, 4, 5}]
(* {3} *)Find the 3 nearest elements:
NearestTo[2.5, 3][{1, 2, 3, 4, 5}]
(* {3, 2, 4} *)Please visit the official Wolfram Language Reference for more details.