Where to find descriptions in PS of the ObjectType?

How or where do I find the descriptions of the OBJECTTYPE in PS.  I am SQL'ing the PSPROJECTITEM table for a specific Project. The table itself only has the OBJECTTYPE value which is a number in the column. Along with the number value, I'd like to be able to provide a text description of the OBJECTTYPE associated with the PSPROJECTITEM table.   So far, I do not find a table in PS that contains all the object types.  What I expect to find would be the descriptions associated with the number where the descriptions match what you see in the list