A suspended fourth chord is composed using a root/1st, perfect 4th and a perfect 5th (or R/1-4-5) intervals played simultaneously. Generally written as Csus4 or Csus, it is good practice to simply use an uppercase C with a super scripted sus4 to represent it in writing (ie: Csus4).
Suspended fourth chord profile
|Intervals||root/1st, perfect 4th, perfect 5th or R/1-4-5|
|Common names (examples in C)||Csus4, Csus|
|C Suspended fourth chord voicing #2|