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 facial expression of anger has these distinctive features: 1  Eyebrows pulled down together, 2  Wide open, glairing eyes, 3  Upper eyelids raised in a stare, 4  Lips wide open to form a rectangle, or. 5  tightly closed with the red margins of the lips becoming more narrow, and the lips becoming thinner.