|a fool or simpleton; ninny.| |an extraordinary or unusual
thing, person, or event; an exceptional example or instance.|
|—the chemical symbol for| The symbol for the element rubidium.
The symbol for rubidium. |rubidium (r-bĭd'ē-əm) Pronunciation
Key A soft, silvery-white metallic element of the alkali group.
It ignites spontaneously in air and reacts violently with water.
Rubidium is used in photoelectric cells, in making vacuum tubes,
and in radiometric dating. Atomic number 37; atomic weight
85.47; melting point 38.89°C; boiling point 688°C; specific
gravity (solid) 1.532; valence 1, 2, 3, 4. See Periodic Table.
RB/R-B-L/ Abbreviation: "Realtime Blackhole List". A service
that allows people to blacklist sites for emitting spam, and
makes the blacklist available in real time to electronic-mail
transport programs that know how to use RBL so they can filter
out mail from those sites. Drastic (and controversial) but
effective. There is an RBL home page
(http://maps.vix.com/rbl/usage.html). chemical element of