Pursuant to §1001.405(e), a business entity that is not registered with the board may not represent to the public by way of letters, signs, or symbols as a part of any sign, directory, listing, contract, document, pamphlet, stationery, advertisement, signature, or business name that it is engaged in the practice of engineering by using the terms:(1) "engineer,"(2) "engineering,"(3) "engineering services,"(4) "engineering company,"(5) "engineering, inc.,"(6) "professional engineers,"(7) "licensed engineer,"(8) "registered engineer,"(9) "licensed professional engineer,"(10) "registered professional engineer,"(11) "engineered," or(12) any abbreviation or variation of those terms listed in paragraphs (1) - (11) of this section, or directly or indirectly use or cause to be used any of those terms in combination with other words.