Character entity references can also have the format &name; where name is a case-sensitive alphanumeric string. For example, Î» can also be encoded as &lambda; in an HTML document. The character entity references &lt; , &gt; , &quot; and &amp; are predefined in HTML and SGML, because, ,  and & are already used to delimit markup. This notably does not include XML's &apos; (') entity.
Lack of facial expression. Lack of facial expression: Introduction. An absence of expression on the face is medically called flat affect. In many cases, the face mirrors the underlying emotions, and the person has limited emotions or various emotional or psychological disorders.
The person affected of this condition can present the following symptoms in general: 1  Ptosis â medical term for drooping of the eyelid/s. 2  Miosis â medical terminology for increased constriction of the pupils. 3  The affected side of the face will have a decrease in sweating or medically known as anhidrosis.