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I have achieved a NEBOSH Diploma. May I use designatory letters after my name?

Holders of the following qualifications may use the specified designatory letters after their name:

• NEBOSH National Diploma in Occupational Health and Safety (August 2004, September 2006 and February 2010 specifications)
“DipNEBOSH” 

• NEBOSH National Diploma Part 2 in Occupational Safety and Health (September 1997, September 1999, June 2000, February 2003 specifications)
"Dip2.OSH" or “DipNEBOSH”

• NEBOSH National Diploma in Occupational Safety and Health (May 1988 specification)
"Dip2.OSH" or “DipNEBOSH”

• NEBOSH International Diploma in Occupational Health and Safety (July 2008, August 2011 specifications)
 “IDipNEBOSH” 

• NEBOSH National Diploma in Environmental Management (March 2008, September 2010 specifications)
“EnvDipNEBOSH” 

• NEBOSH Specialist Diploma in Environmental Management (December 1992, January 2002, August 2003 specifications)
"SpDipEM" or "EnvDipNEBOSH”