единый / один сертификат на (все) акции (одного класса)
E.g. single vs separate:
https://www.investopedia.com/terms/s/share-certificate.asp
The shareholder in such a case must return the damaged document to the company before a replacement can be issued. At this time, the shareholder may also exercise the right to be issued a single certificate or separate certificates.
https://www.dnsassociates.co.uk/blog/issue-share-certificate
Generally, a single share certificate allotted to a shareholder for all the number of shares at a specific time, which is also followed as a good business practise by the businesses. Sometimes, shareholders can even ask for split share certificates. It is mainly asked when the company issue shares for more than one class. A separate share certificate will be issued for every class, even though hold by a same shareholder.

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Note added at 1 hr (2021-09-24 07:48:52 GMT)
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https://www.thisismoney.co.uk/money/diyinvesting/article-726...
I hold one single certificate for lots of Diageo shares but only want to sell them slowly to avoid a big tax bill, how can I do this?