The official WPI Seal features many symbols relating to the university and Worcester. Its use is highly restricted in university publications and applications. A modified seal, seen on many university publications and letterheads, is always accompanied by the letters "WPI," while the official seal stands alone, only used in communications of a presidential nature.
- The date of founding (1865) in Roman numerals. The modified seal uses Arabic numerals.
- The university motto, lehr und kunst
- The heart from the City of Worcester crest, symbolizing Worcester as the "Heart of the Commonwealth" of Massachusetts
- Two open books, representing "theory"
- The arm and hammer from Washburn Shops, representing "practice"
The need for a seal was first identified as early as 1884. Professor Alonzo S. Kimball's design was among many submitted by students, and his was ultimately chosen and adopted in June, 1888.