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 acronym stands for Facial drooping, Arm weakness, Speech difficulties and Time to call emergency services. 1  Facial drooping: A section of the face, usually only on one side, that is drooping and hard to move. This can be recognized by a crooked smile. 2  Arm weakness: The inability to raise one's arm fully.