Table:
text: List of National Basketball Association retired jersey numbers
List
List
Number_ Name_ Team Position_ Years_with_franchise Note_
5 Dick Van Arsdale Phoenix Suns G 1968–1977 Also served as head coach (1987).
6 Walter Davis Phoenix Suns G 1977–1988 
7 Kevin Johnson Phoenix Suns G 1988–1998; 2000 Retired in 1998, but came back before the end of the 1999–2000 season before retiring again; currently the mayor of Sacramento.
9 Dan Majerle Phoenix Suns F 1988–1995; 2001–2002 Formerly an assistant head coach for the Phoenix Suns (2008–2013).
24 Tom Chambers Phoenix Suns F 1988–1993 Currently an announcer for Suns games.
33 Alvan Adams Phoenix Suns C 1975–1988 Number unretired for Grant Hill from 2007–2012.
34 Charles Barkley Phoenix Suns F 1992–1996 
42 Connie Hawkins Phoenix Suns F 1969–1973 

text: List of National Basketball Association retired jersey numbers
List
List
Number_ Name_ Team Position_ Years_with_franchise Note_
3 Allen Iverson Philadelphia 76ers G 1996–2006; 2009–2010 
6 Julius Erving Philadelphia 76ers F 1976–1987 
10 Maurice Cheeks Philadelphia 76ers G 1978–1989 Also served as head coach (2005–2008).
13 Wilt Chamberlain Philadelphia 76ers C 1965–1968 
15 Hal Greer Philadelphia 76ers G 1958–1973 During his first five seasons (1958–1963), the team was known as the Syracuse Nationals.
24 Bobby Jones Philadelphia 76ers F 1978–1986 
32 Billy Cunningham Philadelphia 76ers F 1965–1972; 1974–1975 Also served as head coach (1977–1985); briefly unretired for Charles Barkley in the 1991–92 season.
34 Charles Barkley Philadelphia 76ers F 1984–1992 
Microphone Dave Zinkoff Philadelphia 76ers — 1963–1981; 1983–1985 As P.A. announcer.

Question: From the list of National Basketball Association jersey numbers, how many teams have retired a number worn by Charles Barkley?