Also, keep in mind mercury exposure can affect your mental state, so don't assume your personal assessment of your health is valid. It's a good idea to contact Poison Control or consult your physician. Mercury First Aid. If you do get mercury on your skin, seek medical attention and follow professional advice.
Definition of orthotics. : a branch of mechanical and medical science that deals with the design and fitting of orthotics.
Semiotics is the theory and study of signs and symbols, especially as elements of language or other systems of communication. Also known as semiology, semasiology, and semeiology. A person who studies or practices semiotics is known as a semiotician. Many of the terms and concepts used by contemporary semioticians were introduced by Swiss linguist Ferdinand de Saussure (1857-1913). See, for instance, sign, langue, and parole. See Examples and Observations below.