National Information Systems is also listed under the following categories: Standard Yellow Pages Heading (SYPH) Categories:

• Cash Registers & Supplies
• Computers & Equipment
• Security Control Equipment & Systems & Monitoring
• Video Equipment Security & Industrial Systems
• Computer Stores

North American Industry Classification System (NAICS) Categories:

• Electrical Apparatus And Equipment, Wiring Supplies, And Related Equipment Merchant Wholesalers > Alarms, Signaling & Security Equipment > Security Control Equipment
• Radio, Television, And Other Electronics Stores > Television & Video Equipment > Video Equipment Security & Surveillance Systems
• Computer And Software Stores
• Computer And Software Stores > Computer Stores
• Office Supplies And Stationery Stores > Bank & Finance Equipment > Cash Registers & Supplies
• Security Systems Services (Except Locksmiths) > Anti-Theft Alarm Systems Services > Bank Protective Equipment

Standard Industry Classification (SIC) Categories:

• Office Equipment > Bank & Finance Equipment > Cash Registers & Supplies
• Electrical Apparatus & Equipment > Alarms, Signaling & Security Equipment > Security Control Equipment
• Radio, Television, And Consumer Electronics Stores > Television & Video Equipment > Video Equipment Security & Surveillance Systems
• Computer And Computer Software Stores
• Computer And Computer Software Stores > Computer Stores
• Security Systems Services > Anti-Theft Alarm Systems Services > Bank Protective Equipment