I believe we already implemented the numbers for many pieces of airspace in Switzerland, but perhaps there are more to do. I will ask my colleague to look at Italy in this AIRAC period and we'll see how that goes.

Some places also have TMA numbers and use them.
For ex‌ample in Basel "Stay out of TMA 2" or "Cleared to enter TMA 6"

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The same situation applies to The Netherlands, where the EHAM CTR is divided in 3 parts.
T‌he numbers are used in ATC communication, e.g.: 'remain below Schiphol CTR 2'.
The numbers as shown in the AIP-chart:

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Can you tell us more information about how and when ATC refer to those numbers please? Thanks.‌

Where? What country?

Would be possible to include the number next to the CTR name ?
‌thanks