The word "furloughed" is in the guidance.
https://www.gov.uk/government/publications/guidance-to-employers-and-businesses-about-covid-19/covid-19-guidance-for-employees
"Furloughed workers
If your employer cannot cover staff costs due to COVID-19, they may be able to access support to continue paying part of your wage, to avoid redundancies.
If your employer intends to access the Coronavirus Job Retention Scheme, they will discuss with you becoming classified as a furloughed worker. This would mean that you are kept on your employer’s payroll, rather than being laid off.
To qualify for this scheme, you should not undertake work for them while you are furloughed. This will allow your employer to claim a grant of up to 80% of your wage for all employment costs, up to a cap of £2,500 per month.
You will remain employed while furloughed. Your employer could choose to fund the differences between this payment and your salary, but does not have to.
If your salary is reduced as a result of these changes, you may be eligible for support through the welfare system, including Universal Credit.
We intend for the Coronavirus Job Retention Scheme to run for at least 3 months from 1 March 2020, but will extend if necessary."