A suspended second chord is composed using a root/1st, major 2nd and a perfect 5th (or R/1-2-5) intervals played simultaneously. Generally written as Csus2 or C(sus2), it is good practice to simply use an uppercase C with a super scripted sus2 to represent it in writing (ie: Csus2).
Suspended second chord profile
|Intervals||root/1st, major 2nd, perfect 5th or R/1-2-5|
|Common names (examples in C)||Csus2, C(sus2)|
|C Suspended second chord voicing #2|