What are mats?

Some articles on mats:

List Of Team Payrolls In The NHL - Eastern Conference - Northeast Division - Toronto Maple Leafs
1999–2000 $34,000,000 0.00% 2000–01 $41,003,187 20.60% $1,000,000 Mats Sundin $7,500,000 2001–02 $51,565,958 25.76% $1,400,000 Mats Sundin $7,500,000 2002 ...
Microbial Mat - Role in The History of Life - The Cambrian Substrate Revolution
... began to burrow vertically for protection or food, breaking down the microbial mats, and thus allowing water and oxygen to penetrate a considerable distance ... substrate revolution, marine microbial mats are confined to environments in which burrowing is non-existent or negligible very harsh environments, such ...
ATP Champions Tour - 2000
... Henri Leconte 6–0, 0–1 retired None Doha Björn Borg Mats Wilander 3–6, 6–3, John McEnroe Majorca Anders Järryd Mats Wilander 6–1, 6–1 Pat Cash Richmond, Virginia ...