Is there a such thing as an ARINC label for the yaw angle?
Non-authoritative list of some labels:


ARINC 429 Labels


But labels are not all defined in ARINC standard, a specific LRU can define custom values. So you need to get label list from LRU documentation. For instance, labels used by Laseref VI IRS to output values to the bus are:


Source: Honeywell

Your question is ambiguous about what you are looking for: Yaw is the rotation around an axis normal to the plan defined by longitudinal and pitch axes. The origin can be multiple:

  

It can be seen absolute, for instance referenced to the north, and it would be the heading. It can defined relatively to a given direction, e.g. the wind, and it would be computed from other values. More likely it can be a rate.

Here are some related labels:


Yaw rate = 330
Heading: True = 314, Mag = 320
Track angle: True = 313, Mag = 317
Wind direction: True = 316


(octal values)

Could you provide details about your needs?