Thank you for the response. This car was purchased new about 18 months ago by my son-in-law. His manual and all the online resources show a flat dipstick with 2 holes. No one other than he or I has been under the hood since the day he picked it up at the dealership. Nevertheless, the dipstick is as described. In all other respects, it appears to be a standard Toyota dipstick.http://www.toyotaofeasley.com/servicefaqs/how-do-i-check-my-engine-oil-level/
I checked both of my hybrids and there are only 2 marks on DS.
My 2015 has two holes, add, app 1/4" from the bottom of the stick, and full, app 1" up from the add hole.Wait till another 2015 owner will pitch in. MIne are 2007 and 2012.