In the U.S., a unit trust is "An unmanaged portfolio of investments put together by an investment adviser and sold in units to investors by brokers" (from Wall Street Words: An Essential A to Z Guide for Today's Investor).
U.S. unit trusts often have cute names like "Dogs of the Dow," "Diamonds" or "Spiders," although regular Real Estate Investment Trusts (REITS) also qualify as unit trusts. Quotes for these share are available from the same sources as regular stock quotes (see "Stock Prices").
I believe that, in the U.K., "Unit Trust" is the preferred term for a mutual fund.