TS 6662

TS 6662 is a standard concerned with the symbols and other markings used on hearing aids and related equipment. Its focus is on identifying control settings and providing consistent information about technical functions and characteristics, so that the visual language on the product helps users and technicians understand what each control or marking means.

The scope specifically addresses markings used for gain, output, tone and similar controls, as well as switches, selectors and preset controls. It also covers symbols associated with characteristics of earphones and polarity, which are important for interpreting how the equipment is intended to behave. In practical terms, these markings help distinguish one functional adjustment from another at a glance.

Why the marking system matters

Hearing aids are compact, multi-control devices used in settings where clarity and consistency are essential. In general technical terms, symbols are used to reduce ambiguity, support language-independent recognition, and make product operation more repeatable across models. This standard provides the framework for that visual terminology in the hearing-aid domain.

• Helps identify control positions and functions.
• Communicates technical characteristics through visual marks.
• Supports consistent symbol use across related devices.
• Improves interpretation for users and service personnel.

TS 6662 corresponds to IEC 118-11:1983 and is recorded as withdrawn. That makes it a historical standard for marking practice in this field rather than a current active issue, while still useful for understanding the terminology and symbol conventions used in earlier hearing-aid equipment.