| Identify the business or department | Main entrance door or reception area | Permanent identification sign | Acrylic, aluminum, wood, or rigid PVC | 20–60 cm wide × 10–30 cm high | High; readable from the approach path | Use clear wording, strong contrast, durable mounting, and a finish that matches the building interior or exterior. |
| Direct visitors to the correct room | Office, meeting room, consultation room, or classroom door | Room name or room-number sign | Acrylic, aluminum composite, or engraved plastic | 15–30 cm wide × 10–20 cm high | Medium to high; visible before reaching the door | Keep the room name or number prominent. Avoid decorative graphics that reduce legibility. |
| Show whether a room is available | Meeting rooms, treatment rooms, interview rooms, or service counters | Changeable status sign | Sliding acrylic, magnetic panel, or interchangeable insert | 15–30 cm wide × 10–20 cm high | High at close viewing distance | Choose easy-to-update wording such as “Available,” “In Use,” or “Please Wait.” |
| Protect privacy or restrict access | Staff-only doors, storage rooms, records rooms, or back-of-house areas | Restricted-access or staff-only sign | Aluminum, engraved plastic, or laminated rigid PVC | 15–30 cm wide × 10–20 cm high | High contrast at eye level | Use direct language such as “Staff Only” or “Authorized Personnel.” Confirm wording with internal security procedures. |
| Communicate safety information | Fire exits, electrical rooms, maintenance areas, or hazard zones | Safety or warning sign | UV-resistant aluminum, rigid PVC, or photoluminescent material where appropriate | 20–45 cm wide × 15–30 cm high | Very high; readable quickly from a practical distance | Use recognized safety colors and symbols where applicable. Check local fire, building, and workplace-safety requirements. |
| Support accessibility and inclusive navigation | Permanent room identification near the latch side of the door | Tactile and Braille room-identification sign | Acrylic, engraved plastic, or other durable tactile substrate | 15–30 cm wide × 15–25 cm high | Readable visually and by touch | Use raised characters and Braille when required. Placement, character specifications, and mounting height should follow applicable accessibility rules. |
| Promote a service or department | Customer-facing entrance or service-area door | Decorative informational sign | Acrylic, wood, metal, or printed composite panel | 25–60 cm wide × 15–35 cm high | High; visible from the customer approach direction | Limit the message to the service name and one supporting phrase. Keep the design consistent with the surrounding wayfinding signs. |
| Provide temporary instructions | Temporary closure, alternate entrance, renovation, or event area | Temporary adhesive, poster, or reusable panel sign | Laminated paper, corrugated plastic, removable vinyl, or lightweight PVC | 20–45 cm wide × 15–30 cm high | High for the duration of the instruction | Include a concise action, directional arrow when needed, and an end date if the information is time-sensitive. |
| Improve exterior entrance recognition | Exterior entrance door, gate, or access vestibule | Outdoor identification or entrance sign | Powder-coated aluminum, stainless steel, weather-resistant acrylic, or exterior-grade PVC | 30–90 cm wide × 15–45 cm high | Very high; consider daylight and nighttime conditions | Select UV-, moisture-, and temperature-resistant materials. Verify door clearance, fixing method, and local exterior-sign permissions before installation. |