These are Hall of Famers that are donning the Phillies "P".
Robin Evan Roberts

Inducted into the Hall of Fame in 1976 as a pitcher. As a Phillie he won 234 games and lost 199 with an ERA of 3.46, 272 complete games and accrued 1871 strikeouts over 3739.1 innings pitched.
http://www.baseball-reference.com/players/r/roberro01.shtml
http://en.wikipedia.org/wiki/Robin_Roberts_(baseball)
http://www.baseball-reference.com/players/r/roberro01.shtml
http://en.wikipedia.org/wiki/Robin_Roberts_(baseball)
Charles "Chuck" Herbert Klein

Inducted into the Hall of Fame in 1980 as an outfielder. As a Phillie he batted .326 with 963 runs scored, 243 homeruns, 983 RBI's in 5,238 at bats.
http://www.baseball-reference.com/players/k/kleinch01.shtml
http://en.wikipedia.org/wiki/Chuck_Klein
http://www.baseball-reference.com/players/k/kleinch01.shtml
http://en.wikipedia.org/wiki/Chuck_Klein
Steven "Lefty" Norman Carlton

Inducted into the Hall of Fame in 1994 as a pitcher.
As a Phillie he won 241 games and lost 161 with an ERA of 3.09, 185 complete games and accrued 3031 strikeouts over 3697.1 innings pitched.
http://www.baseball-reference.com/players/c/carltst01.shtml
http://en.wikipedia.org/wiki/Steve_Carlton
http://www.baseball-reference.com/players/c/carltst01.shtml
http://en.wikipedia.org/wiki/Steve_Carlton
James "Jim" Paul David Bunning

Inducted into the Hall of Fame in 1994 as a pitcher. As a Phillie he won 89 games and lost 73 with an ERA of 2.93, 65 complete games and accrued 1197 strikeouts over 1520.2 innings pitched.
http://www.baseball-reference.com/players/b/bunniji01.shtml
http://en.wikipedia.org/wiki/Jim_Bunning
http://www.baseball-reference.com/players/b/bunniji01.shtml
http://en.wikipedia.org/wiki/Jim_Bunning
Don Richard "Richie" Ashburn

Inducted into the Hall of Fame in 1995 as an outfielder.
As a Phillie he batted .311 with 1114 runs scored, 1198 walks, 199 stolen bases, 499 RBI's, 97 triples in 7,122 at bats.
http://www.baseball-reference.com/players/a/ashburi01.shtml
http://www.baseball-reference.com/players/a/ashburi01.shtml
Michael Jack Schmidt

Inducted into the Hall of Fame in 1995 as a third baseman and lifetime Phillie. As a Phillie he batted .267 with 1506 runs scored, 548 homeruns, 1595 RBI's, 1507 walks (which 201 were intentional) in 8,352 at bats.
http://www.baseball-reference.com/players/s/schmimi01.shtml
http://en.wikipedia.org/wiki/Mike_Schmidt
http://www.baseball-reference.com/players/s/schmimi01.shtml
http://en.wikipedia.org/wiki/Mike_Schmidt