What is an I55 beam and how does it compare to other common beam types?

[George Zucas]

I was supposed to measure a beam at a far away worksite but after a series of unfortunate events, I wasn't able to. All I know at the moment is it is referred to as I55 beam. I searched for it using every combination of words I can think of but cannot find it. We normally don't use beam classified like this so I don't have any idea about this type.

Any help is appreciated.

 

[Travis_King]

Could they be talking about a wide flange "I-beam", I know there are W18x55 (18 inch deep, 55 lb/ft), W21x55, W24x55.

Not sure how else to help, sorry.